CHEVROLET TAHOE FUEL PUMP PROBLEM

2003 Chevrolet Tahoe • 200,000 miles

This has been an on going issue for probably 50,000 miles now, but if I get below a half of a tank it acts as if its run out of gas. My first would seem the obvious, a fuel pump, or sensor issue since its only acting up with under half a tank. Could this be a simple fix as wiring harness under the seat pinched as I read on here for another 03? Hoping for an easy fix, any suggestions please?